<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="https://search.bilibili.com/">
       <input name="keyword"type="search"
       autocomplete="off"autofocus placeholder="请输入关键字">
       <input type="submit"value="搜索">
    </form>
</body>
</html>